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/*
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2020 Gothel Software e.K.
* Copyright (c) 2020 ZAFENA AB
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef JAU_JAVA_UPLINK_HPP_
#define JAU_JAVA_UPLINK_HPP_
#include <string>
#include <memory>
#include <jau/basic_types.hpp>
namespace jau {
/** @defgroup JavaVM Java Virtual Machine
* Java virtual machine support, helping accessing the JVM and converting data types.
*
* @{
*/
/**
* Pure virtual JavaAnon, hiding Java JNI details from API,
* to be implemented by JNI module.
* <p>
* One implementation is JavaGlobalObj within the JNI module,
* wrapping a JNIGlobalRef instance.
* </p>
*/
class JavaAnon {
public:
virtual ~JavaAnon() noexcept { }
virtual std::string toString() const noexcept { return "JavaAnon[???]"; }
/** Clears the java reference, i.e. nulling it, without deleting the global reference via JNI. */
virtual void clear() noexcept = 0;
};
/**
* Sharing the anonymous Java object (JavaAnon),
* i.e. exposing the Java object uplink to the C++ implementation.
*/
class JavaUplink {
private:
std::shared_ptr<JavaAnon> javaObjectRef;
public:
virtual std::string toString() const noexcept { return "JavaUplink["+jau::to_hexstring(this)+"]"; }
virtual std::string get_java_class() const noexcept = 0;
std::string javaObjectToString() const noexcept {
if( nullptr == javaObjectRef ) {
return "JavaAnon[null]";
} else if( 0 == javaObjectRef.use_count() ) { // safe-guard for concurrent dtor
return "JavaAnon[empty]";
}
return javaObjectRef->toString();
}
std::shared_ptr<JavaAnon> getJavaObject() noexcept { return javaObjectRef; }
/** Assigns a new shared JavaAnon reference, replaced item might be deleted via JNI from dtor */
void setJavaObject(std::shared_ptr<JavaAnon> objRef) noexcept { javaObjectRef = objRef; }
/** Resets the shared JavaAnon reference, the replaced item might be deleted via JNI from dtor */
void setJavaObject() noexcept { javaObjectRef.reset(); }
/** Clears the java reference, i.e. nulling it, without deleting the global reference via JNI. */
void clearJavaObject() noexcept {
if( nullptr != javaObjectRef ) {
javaObjectRef->clear();
}
}
/**
* Throws an IllegalStateException if isValid() == false
*/
virtual void checkValid() const {}
virtual ~JavaUplink() noexcept {
javaObjectRef = nullptr;
}
};
/**@}*/
} /* namespace jau */
#endif /* JAU_JAVA_UPLINK_HPP_ */
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